CONTENTS 
Page. 
SWINGLE, WALTER T. Merrillia, a new genus of the tribe 
Citreae from the Malay Peninsula 335 
BROWN, WILLIAM H. The theory of limiting factors 345 
BROWN, WILLIAM H., and TRELEASE, SAM F. Alternate 
shrinkage and elongation of growing stems of Oestrum noc- 
turnum 353 
YATES, HARRY S. Some recently collected Philippine fungi, II.. 361 
ERRATA 385 
INDEX 387 
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